title =        {Toward strong, usable access control for shared distributed data},
  author =       {Michelle L. Mazurek and Yuan Liang and William Melicher and Manya Sleeper and Lujo Bauer and Gregory R. Ganger and Nitin Gupta and Michael K. Reiter},
  booktitle =    {Proceedings of the 12th USENIX Conference on File and Storage Technologies (FAST '14)},
  month =        feb,
  year =         2014,
  publisher =    {USENIX},
  url =          {http://www.ece.cmu.edu/~lbauer/papers/2014/fast2014-penumbra.pdf},
  keywords =     {access control, logic-based access control}